单项选择题

The two old debates are significant because ______.

A．it has profound value to researchers
B．it has academic appeal
C．people's beliefs about human nature can lead to dangerous actions
D．it forms the basis for our political policies

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单项选择题

The tone of this article would best be described as ______.

A．informative
B．critical
C．exploratory
D．perplexed

单项选择题

According to the text, the problem that the scale of the study of human nature brought is ______.

A．that it is mysterious
B．insights lead to more questions and mystery
C．it is almost always used for the wrong purposes
D．there are too many competing theories